264200-79-5Relevant academic research and scientific papers
Reactions of the dirhenium(II) complexes Re2X4(μ-dppm)2 (X = Cl, Br; dppm = Ph2PCH2PPh2) with isocyanides Part XX. Oxidation of the complexes Re2X4(μ-dppm)2(L) (X = Cl or Br; dppm = Ph2PCH2PPh2; L = t-BuNC, XylNC or CO)
Chantler, James,Kort, David A.,Fanwick, Phillip E.,Walton, Richard A.
, p. 27 - 35 (2007/10/03)
The reactions of the halogens X2 (X = Cl or Br) with the diamagnetic dirhenium(II) complexes Re2X4(μ-dppm)2(L), where dppm = Ph2PCH2PPh2, X = Cl or Br, and L = XylNC (xylyl isocyanide), t-BuNC or CO, and with salts of the edge-sharing bioctahedral species [Re2X3(μ-dppm)2(CO)(NCMe)2] +, provide convenient routes to the dirhenium(III) species [Re2X5(μ-dppm)2(L)]+. These cations, where L = XylNC, t-BuNC or CO, have been isolated as their halide (Cl- or Br3-), [PF6]- and [O3SCF3]- salts. IR spectroscopy shows that terminal RNC and CO ligands are present, and a crystal structure determination of the complex [Re2Cl5(μ-dppm)2(CO)]PF6 confirms that the cation has the edge-sharing bioctahedral structure [Re2(μ-Cl)2(μ-dppm)2Cl 3(CO)]+ with a formal Re=Re bond (Re-Re distance = 2.6607(4) A?). 31P-NMR spectroscopy indicates that these salts are weakly paramagnetic, with their P resonances exhibiting unusually large upfield shifts.
